Koalas are typically solitary animals. In the wild, stick to the rule of one individual per tree, coming together only if there are not enough suitable trees. They are known to be rather solitary due to their lack of energy. Because eucalyptus leaves are low in nutrition and high in toxins and fiber, all of their energy is spent towards digestion. They conserve energy by sleeping 18-22 hours a day.
During breeding season, males make loud bellowing noises to announce their presence and warn off other males. Females are relatively quiet, only making noises when they feel in distress or harassed.
A newborn “joey” koala is only about 2 cm long and is blind and furless